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3. Inspect crankcase bearing bores. Replace the
crankcase assembly if a bearing bore is galled or if
bearing inserts have rotated in the case.
4. Be sure alignment pins are in place where used.
5. Refer to Oil Flow Chart, page 3.6 at the beginning of
this chapter and trace the oil paths through the
crankcase and cylinder.
6. Flush all oil passages with solvent and then warm
soapy water. Rinse with clear, warm water and dry
with compressed air.
7. Be sure passages are clean and dry before
assembling the upper crankcase.
PISTON RING INSTALLATION
NOTE
Apply clean engine oil to all ring surfaces and ring lands
upon installation. Always check piston ring installed gap
before rings are installed on piston (see Piston Ring
Installed Gap, page 3.69). Clean accumulated carbon
from piston ring grooves and oil ring lube holes if piston
has been in service.
q
Top Ring
w
Second Ring
e
Upper Rail
1. Place oil control ring expander in oil ring groove.
Rotate expander in groove until butt ends are on PTO
y
side of piston
.
NOTE
Ends must butt squarely together and must not overlap.
9928491 R04 - 2017-2018 RZR XP Turbo / XP4 Turbo Service Manual
© Copyright Polaris Industries Inc.
r
Spring Expander
t
Lower Rail
ENGINE / COOLING SYSTEM
2. Install lower rail with end gap positioned on the intake
u
side of piston
.
3. Install upper rail with end gap positioned on the
i
exhaust side of piston
.
4. Install second compression ring with marking facing
o
top of piston
. Rotate ring to position the end gap
toward intake side of piston as shown below.
5. Install top compression ring with marks facing top of
a
piston
. Rotate ring to position the end gap toward
exhaust side of piston as shown below.
6. Be sure top and second rings rotate freely in their
grooves and do not bind when compressed by hand.
3
3.73
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Troubleshooting
